72 Transactions. 



Hinge-plate edentulous under the beaks, posteriorly with four 

 nearly horizontal, anteriorly with four highly inclined small 

 teeth. Interior rayed by imprint of external sculpture. Mar- 

 gin finely crenulate within except at byssal gape. Length, 

 3 mm. ; height, 2-15 mm. ; depth of single valve, 1 mm. 



This species, represented by numerous specimens, is 

 nearest allied to the Australian B. perversidens, from which it 

 differs by the less development of the posterior side. 



Pleurodon maorianus, Hedley. 



Pleurodon maorianus, Hedlev. " Eecords of the Australian 

 Museum," v., 1904, p. 87,' fig. 14. 



This species appeared in profusion. 



Dacrydium pelseneeri, n. sp. Plate II, fig. 8. 



Shell small, thin, translucid with a nacreous lustre, oblong 

 inflated, straight on the anterior side, rounded dorsally and 

 ventraiiy, almost angled at the anterior dorsal corner. Umbo 

 slightly projecting. A thin membranous epidermis clothes 

 the valve. Sculpture regular-spaced elevated growth-lines. 

 Hinge with a few anterior teeth, and a long row of posterior 

 teeth which increase in size as they recede from the chondro- 

 phore. Height, 2-2 mm. ; length, 1-48 mm. 



A pair of valves. 



The above is the third species recorded from the Southern 

 Hemisphere. D. albidum was described by Pelseneer (Result 

 Voy. "Belgica," Moll.. 1903, p. 27, pi. viii, f. 10) from 200 

 fathoms in the South Pacific, near the Antarctic ice-barner. 

 D. fabale was described bv mvself (P.L.S.N.S.W., xxix, 1904, 

 p. 199, pi. x, f. 39) from 100 fathoms off Wollongong, N.S.W. 

 From Marion Island E. A. Smith has published Dacrydium 

 meridionahs, but Bernard has shown (Journ. de Conch., xlv, 

 1897, p. 8) that this is probably a Philobrya. 



The novelty appears to differ from I), albidum by its rough 

 surface and by its greater length in proportion to height. 

 From its nearer ally D. fabale it differs by the straight edge 

 of the anterior margin, and by being smaller and proportionally 

 shorter. 



Cochlodesma angasi, Crosse and Fischer. 



Periploma angasi,, Crosse and Fischer, Journ. de Conch., 1864, 

 p\ 349: 1865, p. 427. pi. xi, f. 1. 



A single valve. 



Verticordia rhomboidea, n. sp. Plate II, figs. 12, 13, 14. 



Shell inflated, subrhomboidal, inequilateral, right valve 

 slightly clasping over the left along the dorsal margin, sub- 



